摘要
Composition dependence of martensitic transformations as well as the magnetic properties for the Ni_2 Mn_(1+x)In_(1-x)(0.25≤x≤0.58)alloys were investigated by using the first-principles calculations.Key results demonstrate that the stability of parent austenite(A)decreases gradually with increasing Mn content whilst it is opposite for the martensitic phase.This causes the total energy difference between the austenite and martensite phases increscent with increasing Mn contents.When x=0.33,the martensite transformation during cooling is PA→FA→NM.When x≥0.42,an intermartensitic transformation occurs from modulated 6 M martensite to non-modulated(NM)martensite with the martensite transformation sequence of PA→FA→6 M→NM.The martensitic transformation from austenite to martensite accompanies the transition from ferromagnetic to ferrimagnetic state.This is a typical magneto-structural coupling transformation.The analysis of the density of states demonstrates that the Ni 3 d state plays an important role in the phase stability.
基金
supported by the National Natural Science Foundation of China(Grant No.51771044)
Natural Science Foundation of Hebei Province(No.E2019501061)
Fundamental Research Funds for the Central Universities(No.N2023027)
Programme of Introducing Talents of Discipline Innovation to Universities 2.0(the 111Project of China 2.0,No.BP0719037)
the Liao Ning Revitalization Talents Program(Grant No.XLYC1802023)。
